20345154554849 has 2 divisors, whose sum is σ = 20345154554850. Its totient is φ = 20345154554848.

The previous prime is 20345154554833. The next prime is 20345154554863. The reversal of 20345154554849 is 94845545154302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10896865081600 + 9448289473249 = 3301040^2 + 3073807^2 .

It is a cyclic number.

It is not a de Polignac number, because 20345154554849 - 2⁴ = 20345154554833 is a prime.

It is a super-2 number, since 2×20345154554849² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20345154554449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172577277424 + 10172577277425.

It is an arithmetic number, because the mean of its divisors is an integer number (10172577277425).

Almost surely, 2^{20345154554849} is an apocalyptic number.

It is an amenable number.

20345154554849 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345154554849 is an equidigital number, since it uses as much as digits as its factorization.

20345154554849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120000, while the sum is 59.

The spelling of 20345154554849 in words is "twenty trillion, three hundred forty-five billion, one hundred fifty-four million, five hundred fifty-four thousand, eight hundred forty-nine".